A skin biopsy involves removing a small sample of skin tissue to examine it under a microscope. Dermatologists and trained nurses use this diagnostic procedure to confirm or rule out specific skin disorders. Common indications include persistent rashes, suspicious pigmented lesions, bullous diseases, chronic ulcers, and persistent nodules. The clinical appearance alone is often insufficient for a definitive diagnosis, making histological examination necessary.
Different diagnostic questions require different sampling techniques.
Before any skin biopsy, nurses must conduct a thorough patient assessment. Inquire about bleeding disorders or the use of anticoagulant medications like warfarin or aspirin, as these increase hemorrhage risks. Check for known allergies to local anesthetics, latex, or antiseptic solutions such as iodine. Obtain informed consent, ensuring the patient understands the procedure, expected scarring, and potential risks. Finally, clean the biopsy site gently with mild soap or an appropriate antiseptic.
Gathering the correct sterile equipment ensures procedural efficiency. Essential items include sterile gloves, local anesthetic (usually 1% or 2% lidocaine with or without epinephrine), small syringes, needles, biopsy blades or punch tools, forceps, gauze, suture materials, and specimen containers with formalin.
Lidocaine is injected intradermally using a fine needle to create a small skin wheal, blocking nerve impulses and achieving local numbness before tissue harvesting begins.
Maintain strict sterile technique throughout the procedure. Clean the site with antiseptic and drape the area. Administer the local anesthetic and allow adequate time for it to take effect. Secure the tissue sample using the chosen biopsy method—gently lifting the punch core with forceps or stabilizing the skin during a shave or excision. Control any pinpoint bleeding using pressure, gauze, or a chemical haemostatic agent like silver nitrate or Monsel's solution. Close deeper wounds with sutures if required and apply a sterile dressing.
Proper wound care prevents infection and promotes optimal healing. Instruct the patient to keep the initial bandage clean, dry, and intact for the first 24 to 48 hours. Afterward, they can gently clean the site daily with mild soap and water, apply an antimicrobial ointment, and cover it with a fresh bandage. Advise patients to avoid soaking the wound in baths or swimming pools until sutures are removed. Provide clear instructions on when to return for suture removal, which typically ranges from 5 to 14 days depending on the anatomical site.
Although skin biopsies are minor procedures, complications can occasionally occur. Monitor for signs of localized infection, including increasing redness, warmth, purulent discharge, and worsening pain. Minor bleeding or hematoma formation can develop hours after the procedure; teach the patient to apply firm, direct pressure for 15 minutes if bleeding occurs. Other potential issues include allergic reactions to dressings or anesthetics, scar hypertrophy, and persistent nerve or tendon damage in sensitive anatomical areas.
Accurate pathology results depend heavily on proper specimen handling. Place the harvested tissue specimen immediately into a container filled with 10% neutral buffered formalin, ensuring the tissue is fully submerged to prevent autolysis. Label the container accurately with the patient's full name, hospital number, date of birth, exact anatomical site of the biopsy, and date of collection. Complete the pathology requisition form thoroughly, noting clinical history and differential diagnoses, before transporting the specimen securely to the laboratory.